Java tutorial
/* * The MIT License (MIT) * * Copyright (c) 2014-2015 Cloudee Huang ( https://github.com/cloudeecn / cloudeecn@gmail.com ) * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package works.cirno.mocha; import java.util.concurrent.ConcurrentHashMap; import javax.inject.Named; import javax.inject.Singleton; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.web.context.support.SpringBeanAutowiringSupport; @Named @Singleton public class SpringMVCFactory implements ObjectFactory, ApplicationContextAware { private static final Logger log = LoggerFactory.getLogger(SpringMVCFactory.class); private ApplicationContext applicationContext; private ConcurrentHashMap<Class<?>, Object> unmanagedBeans = new ConcurrentHashMap<>(4); AutowiredAnnotationBeanPostProcessor processer; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.applicationContext = applicationContext; processer = new AutowiredAnnotationBeanPostProcessor(); processer.setBeanFactory(applicationContext.getAutowireCapableBeanFactory()); } public static ObjectFactory fromCustomApplicationContext(ApplicationContext ac) { ObjectFactory factory; try { factory = ac.getBean(SpringMVCFactory.class); log.info("SpringObjectFactory got from application context"); } catch (NoSuchBeanDefinitionException e) { factory = ac.getAutowireCapableBeanFactory().createBean(SpringMVCFactory.class); log.info("SpringObjectFactory created"); } return factory; } @Override public <T> T getInstance(TypeOrInstance<T> param) { switch (param.getInjectBy()) { case INSTANCE: return param.getInstance(); case NAME_TYPE: return applicationContext.getBean(param.getName(), param.getType()); case TYPE: try { return applicationContext.getBean(param.getType()); } catch (NoSuchBeanDefinitionException e) { Class<? extends T> type = param.getType(); @SuppressWarnings("unchecked") T result = (T) unmanagedBeans.get(type); if (result == null) { log.warn("Can't find bean for type {} will manage bean as singleton", type); try { result = type.newInstance(); } catch (InstantiationException | IllegalAccessException e1) { log.error("Can't instantiate {}.", type.getName(), e1); throw new NoSuchBeanDefinitionException(type); } processer.processInjection(result); unmanagedBeans.put(type, result); } return result; } } throw new UnsupportedOperationException("Unknown injection type " + param.getInjectBy()); } }